ON THE DISTRIBUTION OF VITAMINS A1 AND As
نویسنده
چکیده
In the rods of certain fresh-water fishes rhodopsin is replaced by a purple photolabile pigment which I have suggested be called porphyropsin. This was first observed in situ by Kiihne and Sewall (1880), and was examined spectrographically in solution by K~ittgen and Abelsdorff (1896). Porphyropsin enters a retinal cycle which is identical in form with that of rhodopsin, but contains different carotenoids in the positions of retinene and vitamin A. The substance which replaces vitamin A in the fresh-water fish retina reacts with antimony chloride to yield a deep blue color due to an absorption band at about 696 m/~, accompanied by a broad subsidiary hump at about 640 m# (Wold, 1937). Almost simultaneously with the announcement of these observations, Lederer and Rosanova (1937) reported that substances yielding
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